Not sure wherein the problem exists, but mtpaint 3.40 has quite a broken assortment of fonts. Some will not bold or italicize. About the only font that functions is DejaVu Sans or Serif. That really limiting.

I am using slacko-5.5, and DL from slackware. Does anyone else have this problem?

My WAG (Wild-Ass-Guess) is that mtPaint uses whatever fonts come with Puppy. If the fonts that come with Puppy don't include whatever is needed to make italics, then mtPaint can't do italics. I could be wrong.

Technically, that isn't so - no single font is "able to do" any other style but its own predesigned one. For that, we have font packs - group of font files (can be Truetype or bitmap) with same overall design but different styles. "Regular"/"Book", "Bold", "Italic"/"Oblique", and most times "Bold Italic" too, is the usual set.

But if some style is absent, that is it. Because a different style is a wholly separate font, just designed to look more-or-less alike the baseline font of the same name.

Depends on the font tool.
For the GTK+ based one, the fonts need be indexed by fontconfig - i.e., need be present in one of directories listed in /etc/fonts/fonts.conf at the time when "fc-cache -f" is last run.
For the FreeType based one, the fonts need be indexed by mtPaint itself - as described in section 3.2.7.1 of the handbook.

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